Question

A pulley systemis attached to a massless board as shown below. The board pivots only at the pivot point. A `10 g` mass `M` sits exaxtly in the middle of the board. If the angle `theta` is `60^@`, what is the force `F(i n N)` necessary to hold the board in the position shown.
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Answer 1

Correct Answer - `25 N`
Balancing the torque about pivot
`2F l = Mg(l)/(2)`
`F = (Mg)/(4) rArr F = 25 N`.